AES Decrypt
Authenticate and decrypt a LocalKit AES-256-GCM JSON envelope with its password.
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AES Encrypt
Encrypt UTF-8 text with AES-256-GCM and a password-derived PBKDF2-SHA-256 key. Every run uses a fresh salt and nonce.
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Checksum Calculator
Calculate a checksum of UTF-8 text or local files, choose the algorithm and verify an expected hexadecimal value.
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ECDSA Key Generator
Generate a P-256, P-384 or P-521 signing key pair using Web Crypto and export public and private JWKs.
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File Hash
Calculate SHA-256, SHA-384, SHA-512, SHA-1 or CRC32 checksums for local files and compare an expected checksum.
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HMAC Generator
Compute an HMAC using SHA-256, SHA-384 or SHA-512 and a UTF-8 secret key.
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HMAC-SHA-256 Generator
Calculate an HMAC-SHA-256 message authentication code with a UTF-8 secret key using Web Crypto.
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JWT Decoder
Decode a JSON Web Token header and payload locally without treating its claims as verified.
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JWT Expiration Checker
Inspect exp, nbf and iat claims against the current device time. Decoding does not verify the signature.
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JWT Generator
Sign a JSON claims object as an HS256 JWT with a UTF-8 shared secret of at least 32 bytes.
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JWT Signature Verifier
Verify an HS256 JWT signature with your shared secret and inspect expiration and not-before claims.
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Nano ID Generator
Generate random URL-safe identifiers using a 64-symbol alphabet and cryptographic randomness.
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Passphrase Generator
Choose words independently with uniform cryptographic randomness from your deduplicated word list. Entropy is calculated from list size and word count.
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Password Entropy Calculator
Calculate the theoretical entropy of a uniformly random password from its length and alphabet size. This is not a strength estimate for a human-chosen password.
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Password Generator
Generate random passwords on your device.
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PBKDF2 Tool
Derive key bytes from a password, explicit salt and PBKDF2-SHA-256 parameters using Web Crypto.
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Random ID Generator
Generate identifiers from a custom alphabet using unbiased cryptographic random selection.
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RSA Key Generator
Generate an RSA-OAEP SHA-256 key pair with exponent 65537 and export public and private JWKs.
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Secure Random Bytes
Generate cryptographically random bytes and export exact hexadecimal and base64 representations.
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SHA-1
Calculate a SHA-1 text checksum with Web Crypto. SHA-1 is a legacy hash and is unsuitable for collision-resistant security.
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SHA-256 Hash
Calculate the SHA-256 digest of UTF-8 text.
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SHA-384
Calculate the SHA-384 hash of the exact UTF-8 input text.
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SHA-512
Calculate the SHA-512 hash of the exact UTF-8 input text.
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ULID Generator
Generate ULIDs with a 48-bit Unix millisecond timestamp and 80 cryptographically random bits. Ordering within the same millisecond is random.
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